Pledged Assets and Collateral (Assets Mortgaged, Pledged, or Otherwise Subject to Lien) (Detail) ¥ in Millions |
Mar. 31, 2025
JPY (¥)
|
|---|---|
| Financial Instruments Owned and Pledged as Collateral [Line Items] | |
| Pledged assets | ¥ 46,975,841 |
| Trading account securities | |
| Financial Instruments Owned and Pledged as Collateral [Line Items] | |
| Pledged assets | 12,140,281 |
| Investment securities | |
| Financial Instruments Owned and Pledged as Collateral [Line Items] | |
| Pledged assets | 16,371,212 |
| Loans | |
| Financial Instruments Owned and Pledged as Collateral [Line Items] | |
| Pledged assets | 18,438,447 |
| Other | |
| Financial Instruments Owned and Pledged as Collateral [Line Items] | |
| Pledged assets | ¥ 25,901 |